CSS를 사용하여 체크박스 스타일 버튼에 호버 효과를 추가하는 방법은 무엇입니까?

<code class="html"><div id="ck-button">
  <label>
    <input type="checkbox" value="1">
    <span>red</span>
  </label>
</div></code>

<code class="css">div label input {
  margin-right: 100px;
}

body {
  font-family: sans-serif;
}

#ck-button {
  margin: 4px;
  background-color: #EFEFEF;
  border-radius: 4px;
  border: 1px solid #D0D0D0;
  overflow: auto;
  float: left;
}

#ck-button label {
  float: left;
  width: 4.0em;
}

#ck-button label span {
  text-align: center;
  padding: 3px 0px;
  display: block;
}

#ck-button label input {
  position: absolute;
  top: -20px;
}

#ck-button input:checked + span {
  background-color: #911;
  color: #fff;
}

#ck-button:hover {
  background: red;
}</code>

<code class="css">#ck-button:hover {
  background: red;
}</code>